{"title":"Code Tree Extension and Performance Improvement in OVSF-CDMA Systems","authors":"D. Saini, S. Bhooshan","doi":"10.1109/ICSCN.2007.350755","DOIUrl":null,"url":null,"abstract":"UTRA-FDD systems use orthogonal variable spreading factor (OVSF) codes for channel separation in uplink and downlink. The OVSF codes are the limited resources in the downlink. The limited codes as well as code blocking property of OVSF codes gives lower system throughput. In this paper the OVSF code tree is extended such that the capacity of the tree becomes four times. Also the modified system uses single rake combiner providing no additional complexity increase in the user equipments (UEs). Simulation results are demonstrated to show the reduction in new call blocking probability using the OVSF code tree extension","PeriodicalId":257948,"journal":{"name":"2007 International Conference on Signal Processing, Communications and Networking","volume":"303 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2007-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"6","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2007 International Conference on Signal Processing, Communications and Networking","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ICSCN.2007.350755","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 6
Abstract
UTRA-FDD systems use orthogonal variable spreading factor (OVSF) codes for channel separation in uplink and downlink. The OVSF codes are the limited resources in the downlink. The limited codes as well as code blocking property of OVSF codes gives lower system throughput. In this paper the OVSF code tree is extended such that the capacity of the tree becomes four times. Also the modified system uses single rake combiner providing no additional complexity increase in the user equipments (UEs). Simulation results are demonstrated to show the reduction in new call blocking probability using the OVSF code tree extension
京公网安备 11010802042870号
京ICP备2023020795号-1
分享
求助内容：
应助结果提醒方式：
扫码关注我们
